CN109772222B - Gas mixer - Google Patents
Gas mixer Download PDFInfo
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- CN109772222B CN109772222B CN201910166693.4A CN201910166693A CN109772222B CN 109772222 B CN109772222 B CN 109772222B CN 201910166693 A CN201910166693 A CN 201910166693A CN 109772222 B CN109772222 B CN 109772222B
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Abstract
The invention belongs to the field of fluid driving, and particularly relates to a gas mixer. The end covers are arranged on the upper side and the lower side of the main body, the transducer is pressed in an upper sinking cavity of the main body through the sealing ring, and the transducer is formed by bonding a substrate and a piezoelectric sheet; the transducer, the main body and the sealing ring in the upper sinking cavity form an upper containing cavity, and the transducer, the main body and the sealing ring in the sinking cavity form a lower containing cavity; the upper and lower cavities which are symmetrically arranged are connected in parallel to form a cavity group, and two cavity groups which are adjacent to each other at the left and right are connected in series; the transducer in the leftmost upper cavity is connected with a power supply through a group of wires, and the transducer and other transducers in the leftmost lower cavity are connected with the power supply through another group of wires; the upper and lower chambers in one chamber group simultaneously suck or discharge gas, the driving voltages of the transducers in the leftmost upper and lower chambers are the same, the gas mixing ratio is adjusted through the flow areas of the upper and lower inlet holes, and the gas mixing ratio is adjusted through the driving voltages of the transducers in the leftmost upper and lower chambers.
Description
Technical Field
The invention belongs to the field of fluid transmission and control, and particularly relates to a gas mixer.
Background
The fluid mixer is an indispensable key flow control device in the fields of biochemistry, medical treatment, food, environmental monitoring and the like. The initial fluid mixers are mostly passive, the flow field distribution is changed by arranging a special geometric structure in a fluid motion path and the mixing is realized by combining the free diffusion of fluid molecules, the structure is simple, the manufacture and the integration are easy, the performance is stable, and the defects are that the mixing flow is longer, the speed is slow and the mixing process is uncontrollable; recently, various types of active fluid mixers have been proposed in succession to promote fluid mixing by external power, and the existing active fluid mixers mainly include two types, i.e., electromagnetic type and piezoelectric type, according to the power source, wherein the piezoelectric fluid mixer has a simple structure, a small volume, and good mixing effect and process controllability. The existing piezoelectric type active mixer basically uses a single piezoelectric vibrator as an energy converter to synchronously realize the dual functions of fluid pumping and mixing, the fluid pumping energy is limited, and the requirements of gas mixing with large conveying capacity and high output pressure cannot be met; in addition, the conventional piezoelectric fluid mixer adopts the same transducer to synchronously drive two different fluids, namely, the two fluids are simultaneously sucked through two inlets of the same cavity, so that the pumping quantities of the two fluids cannot be accurately controlled. Obviously, the driving capability, mixing effect and mixing ratio precision of the piezoelectric fluid mixer are all to be further improved.
Disclosure of Invention
In order to improve the conveying capacity, the mixing effect and the mixing proportion precision of the mixer, the invention provides a gas mixer, and the embodiment of the invention is as follows: the main body is provided with an upper inlet hole, a lower inlet hole, an outlet hole and at least two sinking cavity groups consisting of upper sinking cavities and lower sinking cavities which are symmetrically arranged, and the side walls of the upper sinking cavities and the lower sinking cavities are provided with wiring grooves; an upper inlet cavity is arranged on the bottom wall of the upper sinking cavity, an upper outlet cavity is also arranged on the bottom wall of the rightmost upper sinking cavity, a lower inlet cavity is arranged on the top wall of the lower sinking cavity, a lower outlet cavity is also arranged on the top wall of the rightmost lower sinking cavity, and the upper outlet cavity and the lower outlet cavity are communicated with the outlet hole; the upper and lower inlet cavities of the leftmost sinking cavity group are respectively communicated with the upper and lower inlet holes, the upper and lower inlet cavities in the other same sinking cavity groups are communicated through the inflow hole, and the upper and lower sinking cavities in the other sinking cavity groups except the rightmost sinking cavity group are also communicated through the outflow hole; the two left and right adjacent inflow and outflow holes are communicated through the mixed flow hole, and the flow areas of the inflow and outflow holes are equal and not more than half of the flow area of the mixed flow hole; the end covers are arranged on the upper side and the lower side of the main body through screws, the transducer is pressed and connected in the upper sinking cavity through sealing rings, and the sealing rings are positioned on the upper side and the lower side of the transducer; the transducer is formed by bonding a substrate and a piezoelectric plate, the piezoelectric plate is arranged close to an end cover, and the surface of the transducer is coated with insulating paint or bonded with an insulating film; the upper inlet cavity, the lower inlet cavity and the one-way valve arranged in the upper inlet cavity and the lower inlet cavity respectively form an upper inlet valve and a lower inlet valve, and the upper outlet cavity, the lower outlet cavity and the one-way valve arranged in the upper outlet cavity and the lower outlet cavity respectively form an upper outlet valve and a lower outlet valve; the check valve is formed by sequentially bonding a pressure ring, a valve plate and a valve seat, the valve plate is composed of a cover plate, a ring plate and at least three spiral sheets for connecting the cover plate and the ring plate, and two sides of the ring plate are respectively bonded with the pressure ring and the valve seat; the valve plate is adhered with the front spiral sheet and is pre-bent towards one side of the ring sheet, and the adhered back cover sheet is blocked on a valve hole of the valve seat; the transducer, the main body and the sealing ring in the upper sinking cavity form an upper containing cavity, and the transducer, the main body and the sealing ring in the sinking cavity form a lower containing cavity; the upper and lower cavities which are symmetrically arranged are connected in parallel to form a cavity group, and two cavity groups which are adjacent to each other at the left and right are connected in series; the polarization directions of two transducers in the same cavity group are the same, and the polarization directions of the transducers in two adjacent cavity groups are opposite, wherein the same polarization direction means that the polarization directions all point to the piezoelectric sheet from the substrate or all point to the substrate from the piezoelectric sheet; the transducer in the leftmost upper cavity, i.e. the upper cavity adjacent to the upper access opening, is connected to a power supply by one set of wires, and the transducer and other transducers in the leftmost lower cavity are connected to the power supply by another set of wires.
In the invention, the upper and lower cavities in one cavity group simultaneously suck or discharge gas, the discharged gas is passively mixed through the mixed flow hole and then enters the upper and lower cavities of the next cavity group for active mixing, the actively mixed gas enters the next mixed flow hole for passive mixing, and the gas conveying and mixing are completed repeatedly. The gas mixing proportion is adjusted through the flow areas of the upper inlet hole and the lower inlet hole when the driving voltages of the energy converters in the upper and lower cavities at the leftmost side are the same, and the gas mixing proportion is adjusted through the driving voltages of the energy converters in the upper and lower cavities at the leftmost side when the flow areas of the upper inlet hole and the lower inlet hole are the same.
Taking a mixer with three cavity groups as an example, from left to right, the upper inlet valves are sequentially defined as an upper inlet valve I, an upper inlet valve II and an upper inlet valve III, the lower inlet valves are sequentially defined as an upper inlet valve I, an upper inlet valve II and an upper inlet valve III, the upper cavities are sequentially defined as an upper cavity I, an upper cavity II and an upper cavity III, and the lower cavities are sequentially defined as a lower cavity I, an upper cavity II and a lower cavity III; the working process is as follows: in the upper half period, the volumes of the first upper cavity, the first third lower cavity and the first lower cavity are increased, the volumes of the second upper cavity and the second lower cavity are reduced, the first upper inlet valve, the third upper inlet valve, the first lower inlet valve, the second upper inlet valve, the second lower inlet valve, the upper outlet valve and the lower outlet valve are opened, the first upper cavity sucks one gas from an upper inlet hole, the first lower cavity sucks the other gas from a lower inlet hole, and the gases in the second upper cavity and the second lower cavity are mixed through a mixed flow hole and then enter the third upper cavity and the third lower cavity; in the lower half period, the volumes of the first upper cavity, the third upper cavity and the first lower cavity are reduced, the volumes of the second upper cavity and the second lower cavity are increased, the first upper inlet valve, the third upper inlet valve, the first lower inlet valve, the third lower inlet valve, the second upper outlet valve and the second lower outlet valve are closed, the gas in the first upper cavity and the first lower cavity is mixed through the mixed flow hole and then enters the second upper cavity and the second lower cavity, and the gas in the third upper cavity and the third lower cavity enters the outlet hole; because the volume of the mixing hole is more than twice of the volume change of the upper and lower cavities in one cavity group in one period, gas discharged from at least two sides simultaneously exists in the mixing hole on the leftmost side, the passive mixing effect is improved, the gas enters the next cavity group after being primarily mixed, and enters the next mixing hole after being actively mixed through the vibration of the transducer for passive mixing; in the working process, except for the upper cavity I and the lower cavity I, other cavities have double functions of gas pumping and active mixing.
In the invention, the transducer is formed by bonding a PZT4 wafer with equal thickness and a brass substrate, the flow areas of an upper inlet hole and a lower inlet hole are the same, and the output flow and the pressure of two gases mixed in equal proportion are as follows:
in the formula: etaq、ηpFlow and pressure correction coefficients related to system parameters are respectively represented by R, H, the radius and the height of the sinking cavity are respectively represented by H, H is not less than the deformation of the central point of the transducer under the action of the maximum input voltage when P is 0pIs the thickness of the piezoelectric plate, f is the excitation frequency, U0For the driving voltage, N is the number of groups of cavities, β0Is the gas equivalent bulk modulus.
Advantages and features: through synchronous driving and mixing of multiple cavities, the fluid conveying capacity is high, active mixing in the cavities is combined with passive mixing of the mixing holes, the mixing effect is good, and the device is suitable for continuous mixing and distribution of high-viscosity fluid; the two cavities are used for sucking different fluids, the mixing proportion is easily controlled by driving voltage or the flow area of the inlet hole, and the proportioning precision is high.
Drawings
FIG. 1 is a schematic sectional view of a mixer according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the deformation of the upper peripheral transducer and the opening and closing of the valve in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the lower half-cycle transducer deformation and the valve opening and closing in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a main body according to a preferred embodiment of the present invention;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a schematic illustration of the construction of a butterfly valve in accordance with a preferred embodiment of the invention;
FIG. 7 is a schematic view of the structure of the valve plate according to a preferred embodiment of the present invention;
fig. 8 is a sectional view taken along line B-B of fig. 7.
Detailed Description
An upper inlet hole a1, a lower inlet hole a2, an outlet hole a3 and at least two sinking cavity groups consisting of an upper sinking cavity a4 and a sinking cavity a5 which are symmetrically arranged are arranged on the main body a, and wiring grooves a6 are formed in the side walls of the upper sinking cavity a4 and the sinking cavity a 5; an upper outlet cavity a8 is further arranged on the bottom wall of the upper sinking cavity a4, which is provided with an upper inlet cavity a7 and a rightmost upper sinking cavity a4, a lower inlet cavity a7 ' is arranged on the top wall of the lower sinking cavity a5, a lower outlet cavity a8 ' is further arranged on the top wall of the rightmost lower sinking cavity a5, and the upper outlet cavity a8 and the lower outlet cavity a8 ' are communicated with an outlet hole a 3; the upper inlet cavity a7 and the lower inlet cavity a7 'of the leftmost sinking cavity group are respectively communicated with the upper inlet hole a1 and the lower inlet hole a2, the upper inlet cavity a7 and the lower inlet cavity a 7' of the rest of the same sinking cavity group are communicated through the inflow hole a9, and the upper sinking cavity a4 and the lower sinking cavity a5 of the other sinking cavity groups except the rightmost sinking cavity group are also communicated through the outflow hole a 10; two left and right adjacent inflow holes a9 and outflow holes a10 are communicated through a mixing hole a11, and the flow areas of the inflow hole a9 and the outflow hole a10 are equal and not more than half of the flow area of the mixing hole a 11; the end covers b are arranged on the upper side and the lower side of the main body a through screws, the transducer d is pressed and connected in the upper sinking cavity a4 and the sinking cavity a5 through the end cover bosses b1 through sealing rings e, and the sealing rings e are positioned on the upper side and the lower side of the transducer d; the transducer d is formed by bonding a substrate d1 and a piezoelectric sheet d2, the piezoelectric sheet d2 is installed close to the end cover b, and the surface of the transducer d is coated with insulating paint or bonded with an insulating film; the upper inlet cavity a7, the lower inlet cavity a7 'and the one-way valve c arranged in the upper inlet cavity a7 and the lower inlet cavity a 7' respectively form an upper inlet valve sin and a lower inlet valve xin, and the upper outlet cavity a8, the lower outlet cavity a8 'and the one-way valve c arranged in the lower outlet cavity a 8' respectively form an upper outlet valve so and a lower outlet valve xo; the check valve c is formed by sequentially bonding a pressing ring k, a valve plate i and a valve seat j, the valve plate i is formed by a cover plate i1, a ring plate i3 and at least three spiral plates i2 which are used for connecting the cover plate i1 and the ring plate i3, and two sides of the ring plate i3 are bonded with the pressing ring k and the valve seat j respectively; the valve plate i is adhered with the front spiral sheet i2 and is pre-bent towards one side of the ring sheet i3, and the adhered rear cover sheet i1 is blocked on a valve hole of the valve seat j; an upper cavity scn is formed by the transducer d in the upper sinking cavity a4, the main body a and the sealing ring e, and a lower cavity xcn is formed by the transducer d in the lower sinking cavity a5, the main body a and the sealing ring e; the upper cavity scn and the lower cavity xcn which are symmetrical up and down are connected in parallel to form a cavity group, and the two cavity groups which are adjacent left and right are connected in series; the polarization directions p of two transducers d in the same cavity group are the same, and the polarization directions p of the transducers d in two adjacent cavity groups are opposite, wherein the same polarization directions mean that the polarization directions all point to the piezoelectric sheet d2 from the substrate d1 or all point to the substrate d1 from the piezoelectric sheet d 2; transducer d in the leftmost upper volume scn, i.e. the upper volume scn adjacent to the upper access opening a1, is connected to a power supply by one set of wires, and transducer d and other transducers d in the leftmost lower volume xcn are connected to a power supply by another set of wires; in the present invention, n in sin, xin, scn and xcn denotes a serial number from left to right, and n is 1, 2, 3.
In the invention, the upper chamber scn and the lower chamber xcn in one chamber group simultaneously suck or discharge gas, the discharged gas is passively mixed through the mixing hole a11 and then enters the upper chamber scn and the lower chamber xcn in the next chamber group for active mixing, and the actively mixed gas enters the next mixing hole a11 for passive mixing, and the gas conveying and mixing are completed by repeating the steps. The left-most upper chamber scn is identical to the driving voltage of the transducer d in the lower chamber xcn, and the mixing ratio of the two gases is adjusted by the flow areas of the upper inlet hole a1 and the lower inlet hole a2, and the flow areas of the upper inlet hole a1 and the lower inlet hole a2 are identical to each other, and the mixing ratio of the two gases is adjusted by the driving voltage of the transducer d in the left-most upper chamber scn and the lower chamber xcn.
Taking as an example a mixer with three chamber groups, from left to right, the upper inlet valves sin are defined in turn as upper inlet valves one si1, two si2 and three si3, the lower inlet valves xin are defined in turn as lower inlet valves one xi1, two xi2 and three xi3, the upper chambers scn are defined in turn as upper chambers one sc1, two sc2 and three sc3, and the lower chambers xcn are defined in turn as lower chambers one xc1, two xc2 and three xc 3; the working process is as follows: in the upper half period, the volumes of the upper chamber one sc1, the third sc3 and the lower chamber one xc1 and the third xc3 are increased, the volumes of the upper chamber two sc2 and the lower chamber two xc2 are decreased, the upper inlet valves one si1, three si3, the lower inlet valves one xi1 and three xi3 are opened, the upper inlet valve two si2, the lower inlet valve two xi2, the upper outlet valve so and the lower outlet valve xo are closed, the upper chamber one sc1 sucks one gas from an upper inlet hole a1, the lower chamber one xc1 sucks the other gas from a lower inlet hole a2, and the gases in the upper chamber two sc2 and the lower chamber two xc2 are mixed through a11 and then enter the upper chamber three sc3 and the lower chamber three xc 3; in the lower half period, the volumes of the upper chamber one sc1 and the third sc3 and the lower chamber one xc1 and the third xc3 are reduced, the volumes of the upper chamber two sc2 and the lower chamber two xc2 are increased, the upper inlet valves one si1 and three si3, the lower inlet valves one xi1 and three xi3 are closed, the upper inlet valve two si2, the lower inlet valve two xi2, the upper outlet valve so and the lower outlet valve xo are opened, the gas in the upper chamber one sc1 and the lower chamber one xc1 is mixed through the mixed flow hole a11 and then enters the upper chamber two sc2 and the lower chamber two xc2, and the gas in the upper chamber three sc3 and the lower chamber three xc3 enters the outlet hole a 3; because the volume of the mixing flow hole a11 is more than twice of the volume change of the upper chamber scn and the lower chamber xcn in one chamber group in one period, gas discharged from at least two sides simultaneously exists in the mixing flow hole a11 at the leftmost side, the passive mixing effect is increased, the gas is initially mixed and then enters the next chamber group, and the gas is vibrated by the transducer d to realize active mixing and then enters the next mixing flow hole for passive mixing; in the above working process, except for the upper chamber one sc1 and the lower chamber one xc1, the other chambers have the dual functions of gas pumping and active mixing.
In the invention, the transducer d is formed by bonding a PZT4 wafer with equal thickness and a brass substrate, the flow areas of an upper inlet hole a1 and a lower inlet hole a2 are the same, and the output flow and the pressure of two gases mixed in equal proportion are as follows:
in the formula: etaq、ηpFlow and pressure correction coefficients related to system parameters are respectively represented by R, H, the radius and the height of the sinking cavity are respectively represented by R, H, H is not less than the deformation of the central point of the transducer d under the action of the maximum input voltage when P is 0pThickness of the piezoelectric sheet d2, f excitation frequency, U0For the driving voltage, N is the number of groups of cavities, β0Is the gas equivalent bulk modulus.
Claims (1)
1. A gas mixer, characterized by: the main body is provided with an upper inlet hole, a lower inlet hole, an outlet hole and at least two sinking cavity groups consisting of upper sinking cavities and lower sinking cavities which are symmetrically arranged, the bottom wall of each upper sinking cavity is provided with an upper inlet cavity, the bottom wall of the rightmost upper sinking cavity is also provided with an upper outlet cavity, the top wall of each lower sinking cavity is provided with a lower inlet cavity, the top wall of the rightmost lower sinking cavity is also provided with a lower outlet cavity, and the upper outlet cavity and the lower outlet cavity are communicated with the outlet hole; the upper and lower inlet cavities of the leftmost sinking cavity group are respectively communicated with the upper and lower inlet holes, the upper and lower inlet cavities in the same sinking cavity group except the leftmost sinking cavity group are communicated through the inlet hole, and the upper and lower sinking cavities in the other sinking cavity groups except the rightmost sinking cavity group are also communicated through the outlet hole; the inflow and outflow holes in the two left and right adjacent sinking cavity groups are communicated through the mixing hole, and the flow areas of the inflow and outflow holes are equal and not more than half of the flow area of the mixing hole; the end covers are arranged on the upper side and the lower side of the main body, the transducer is pressed and connected in the upper sinking cavity and the lower sinking cavity through the sealing ring, the transducer is formed by bonding a substrate and a piezoelectric sheet, and the piezoelectric sheet is arranged close to the end covers; the upper inlet cavity, the lower inlet cavity and the one-way valve arranged in the upper inlet cavity and the lower inlet cavity respectively form an upper inlet valve and a lower inlet valve, and the upper outlet cavity, the lower outlet cavity and the one-way valve arranged in the upper outlet cavity and the lower outlet cavity respectively form an upper outlet valve and a lower outlet valve; the transducer, the main body and the sealing ring in the upper sinking cavity form an upper containing cavity, and the transducer, the main body and the sealing ring in the sinking cavity form a lower containing cavity; the upper and lower cavities which are symmetrically arranged are connected in parallel to form a cavity group, and two cavity groups which are adjacent to each other at the left and right are connected in series; the polarization directions of two transducers in the same cavity group are the same, and the polarization directions of the transducers in the left cavity group and the right cavity group are opposite; the transducer in the upper cavity on the leftmost side is connected with a power supply through a group of wires, the transducer and other transducers in the lower cavity on the leftmost side are connected with the power supply through another group of wires, and the upper cavity and the lower cavity in one cavity group simultaneously suck or exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910166693.4A CN109772222B (en) | 2019-03-01 | 2019-03-01 | Gas mixer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910166693.4A CN109772222B (en) | 2019-03-01 | 2019-03-01 | Gas mixer |
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| CN109772222A CN109772222A (en) | 2019-05-21 |
| CN109772222B true CN109772222B (en) | 2021-03-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101244371A (en) * | 2008-03-28 | 2008-08-20 | 杨志刚 | Accurate solution matching device |
| CN101362059A (en) * | 2007-08-07 | 2009-02-11 | 国际商业机器公司 | Microfluid mixer, methods of use and methods of manufacture thereof |
| CN103768985A (en) * | 2013-12-25 | 2014-05-07 | 浙江师范大学 | Novel piezoelectric driving microfluid mixer and preparation technology thereof |
| US20170189909A1 (en) * | 2015-12-30 | 2017-07-06 | The Regents Of The University Of California | Enhanced cell/bead encapsulation methods and apparatuses |
| WO2019026936A1 (en) * | 2017-08-01 | 2019-02-07 | 本田技研工業株式会社 | Liquid-mixing apparatus and liquid-mixing method |
-
2019
- 2019-03-01 CN CN201910166693.4A patent/CN109772222B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101362059A (en) * | 2007-08-07 | 2009-02-11 | 国际商业机器公司 | Microfluid mixer, methods of use and methods of manufacture thereof |
| CN101244371A (en) * | 2008-03-28 | 2008-08-20 | 杨志刚 | Accurate solution matching device |
| CN103768985A (en) * | 2013-12-25 | 2014-05-07 | 浙江师范大学 | Novel piezoelectric driving microfluid mixer and preparation technology thereof |
| US20170189909A1 (en) * | 2015-12-30 | 2017-07-06 | The Regents Of The University Of California | Enhanced cell/bead encapsulation methods and apparatuses |
| WO2019026936A1 (en) * | 2017-08-01 | 2019-02-07 | 本田技研工業株式会社 | Liquid-mixing apparatus and liquid-mixing method |
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Effective date of registration: 20220824 Address after: 230000 Room 203, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Hefei Jiuzhou Longteng scientific and technological achievement transformation Co.,Ltd. Address before: 321004 Zhejiang Normal University, 688 Yingbin Avenue, Wucheng District, Jinhua City, Zhejiang Province Patentee before: ZHEJIANG NORMAL University |
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Effective date of registration: 20221017 Address after: 201900 Room 218, Building 2, No. 2121, Baoyang Road, Baoshan District, Shanghai Patentee after: Baoruite Gas Co.,Ltd. Address before: 230000 Room 203, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee before: Hefei Jiuzhou Longteng scientific and technological achievement transformation Co.,Ltd. |